Re: Call for performance evaluation: net.isr.direct (fwd)

From: Andrew Gallatin (gallatin_at_cs.duke.edu)
Date: 10/14/05

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    Date: Fri, 14 Oct 2005 15:19:19 -0400 (EDT)
To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>

    Poul-Henning Kamp writes:
    > The solution is not faster but less reliable timekeeping, the
    > solution is to move the scheduler(s) away from using time as an
    > approximation of cpu cycles.

    So you mean rather than use binuptime() in mi_switch(), use some
    per-cpu cycle counter (like rdtsc)?

    Heck, why not just use ticks for the scheduler and keep the expensive
    timekeeping code out of the critical path altogether? Does it really
    need better than 1ms resolution?

    Drew
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